枯草杆菌碱性磷酸酶制备的最佳工艺条件及酶促反应动力学性质的研究

以枯草杆菌为菌种液体培养制备碱性磷酸酶，研究确定了培养的最佳工艺条件，并对碱性磷酸酶的酶促反应动力学性质进行了初步探讨。结果表明，枯草杆菌制备碱性磷酸酶的最佳工艺条件为：40℃，pH值7．4振荡培养10h，酶活最高。对碱性磷酸酶的动力学性质研究表明，该酶催化底物磷酸苯二钠水解反应的最适pH值8．8，最适温度52℃，米氏常数Km值为2．94mmol／L。     

疏水缔合类聚丙烯酰胺溶液性质研究

综述了疏水缔合类聚丙烯酰胺溶液性质的影响因素以及测定溶液微观形态的研究方法。     

N-萘乙酰基-N''''-邻甲氧基苯甲酰基氨基硫脲的合成与表征

利用α-萘乙酰基异硫氰酸酯与芳基酰肼的加成反应合成了一种新型的酰氨基硫脲衍生物--N-萘乙酰基-N'-邻甲氧基苯甲酰基氨基硫脲,其结构经元素分析、红外光谱、1HNMR和13CNMR所确证.     

Bi2—xPbxSr2Ca2Cu3Oy系高Tc超导体相变的研究

用DSC研究了高T_e超导体B_(2-r)Pb_rSr_2Ca_2Cu_sO_v(x=0,0.2,0.4,0.6)从室温至600℃范围内的相变。在320℃和440℃附近有二个吸热蜂,每一个峰对应一个相变过程。440℃附近的相变是不可递的,其原子激活能为1.37eV,是由高T_e相向低T_e相的转变。而320℃附近的相变则与超结构的形成有关。     

新型干燥设备——直热式燃气纸浆模塑烘干线的设计和制造

介绍了以天然气为燃料的纸浆模塑烘干线的设计过程 ,以及该套设备的制造和安装要点。由于使用了清洁能源 ,所以该套设备能生产出清洁度较高的纸浆模塑包装制品 ,满足电子工业和食品工业对包装制品的要求     

Integrating a membrane and a fluidized pellet reactor for removing hardness: effects of NOM and phosphate

A novel treatment process combining a membrane with outside-in flow configuration and a fluidized pellet rector for removing hardness was studied. The effects of influent water quality, e.g., concentrations of natural organic matter (NOM) and phosphate along with the hydrophobicity of NOM, on the hardness removal efficiency of the novel process were investigated. The hardness removal efficiency decreases with increasing NOM concentration. However, the NOM removal efficiency is independent of NOM concentration and is related to the hydrophobicity of NOM samples. Raw water containing phosphate has adverse impact on the hardness removal efficiency, which decreases from 85% for treating water containing no phosphate to only 38% and 14% for water containing 0.33 mg/L and 1.63 mg/L of phosphate, respectively.     

磷石膏的微量组分及其对水泥凝结、水化和硬化的影响

借助差热分析、热失重、X射线衍射和扫描电镜等测试手段,分析了磷石膏的微量组分,研究了磷石膏对硅酸盐水泥物理性能及水化过程和水化产物的影响,进而探讨了磷石膏对水泥单矿物的水化作用机理。     

纳米TiO_2可见光催化零VOC内墙乳胶漆

介绍了纳米TiO2光催化的机理和特点、纳米TiO2可见光催化零VOC内墙乳胶漆的性能和应用等。表明其不仅是零VOC无毒无害,而且是一种能在一般室内照明条件下净化空气的内墙乳胶漆。     

The Effects of Phenyltrimethoxysilane Coupling Agents on the Properties of PTFE/Silica Composites

A study on PTFE reinforced with SiO₂ was described. This study included the manufactural process of SiO₂-reinforced PTFE and the effects of the content of silane (Z6124) on the properties of the composites material, such as thermal, dielectric properties, tensile strength and morphology, etc. PTFE/silica composites of 60 wt% SiO₂ loaded with a different coupling agent content were mixed by a high-speed dispersion machine and prepared by a two-roll milling machine. Our results show that the sample treated with 3 wt% silane has the highest tensile strength and optimum dielectric properties. Furthermore, the tensile strength and coefficient of thermal expansion (CTE) increase, and the water absorption decreases, with an increasing silane content. These experiments reveal that silane treatment can reduce the overall hydrophilicity of the composites. Finally, predictions on dielectric and CTE properties are discussed. It has been found that experimental values of the dielectric constant agree well with those predicted by the rule of mixture.